Given a non-null, non-empty String, if it starts with "f" return "Fizz".
If it ends with "b" return "Buzz".
If both conditions are true, return "FizzBuzz".
In all other cases, return the String unchanged.
For this problem we're expecting only a method.
Don't define a class, include modifiers like static or public, add import statements, or add code outside the method declaration.